Carla Johnson was a nurse who worked at a local hospital and who regularly donated bone marrow and blood. As such, a bone marrow match on a "Jane Doe's" legs that had been found in Quantico came back to her. She told NCIS Special Agent Leroy Jethro Gibbs and NCIS/Mossad Liaison Officer Ziva David that her legs were her own and she proved helpful in uncovering where the body of the Jane Doe was sent to which soon led Gibbs and Ziva back to local coroner and an enemy of Anthony DiNozzo's, George Stewart.